[U-Boot-Users] [PATCH] Fixed cfi flash read uchar bug.

Zhang Wei-r63237 Wei.Zhang at freescale.com
Thu Jan 25 05:38:11 CET 2007

Hi, Wolfgang,

It's so pity that the flash got wrong 'num_erase_regions' issue is still
in u-boot 1.2.0.

The byte by byte accessing is not preferred. But the flash_read_ushort()
and flash_read_long() in drivers/cfi_flash.c are both implemented by
byte accessing. How about it?

Can the instruction '
	retval = (addr[0] << 16) | (addr[(info->portwidth)] << 24) |
		(addr[(2 * info->portwidth)]) | (addr[(3 *
info->portwidth)] << 8);'
In flash_read_long() be replaced by memcpy() function?

Zhang Wei

> Memcopy might be OK for flash tables but I am not sure if we use the 
> same function to access status registers. I would rather access flash 
> using bus wide accesses instead of byte by byte. Maybe it is 
> safe but I 
> do not know how it behaves in various platforms and bus 
> interface units 
> of various processors. I would take the safe route.
> Best regards,
> Tolunay

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